Unusual Regioselectivity in the Opening of Epoxides by Carboxylic Acid Enediolates
作者:Luis Domingo、Salvador Gil、Margarita Parra、José Segura
DOI:10.3390/molecules13061303
日期:——
Addition of carboxylic acid dianions appears to be a potential alternative to the use of aluminium enolates for nucleophilic ring opening of epoxides. These conditions require the use of a sub-stoichiometric amount of amine (10% mol) for dianion generation and the previous activation of the epoxide with LiCl. Yields are good, with high regioselectivity, but the use of styrene oxide led, unexpectedly
添加羧酸二价阴离子似乎是使用烯醇铝进行环氧化物亲核开环的潜在替代方案。这些条件需要使用亚化学计量的胺 (10% mol) 来生成二价阴离子并预先用 LiCl 活化环氧化物。产率良好,具有高区域选择性,但出乎意料的是,使用氧化苯乙烯导致由于对伯碳原子和仲碳原子的攻击而产生混合物。通常,在初级中心的攻击中可以看到低的非对映选择性,但是从对氧化苯乙烯的二级碳的攻击中只能获得一种非对映异构体。